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Excited states of the 64 Cu (Z = 29, N = 35) nucleus have been probed using heavy-ion induced fusion evaporation reaction and an array of Compton suppressed Clovers as detection system for the emitted γ rays. More than 50 new transitions have been identified and the level scheme of the nucleus has been established upto an excitation energy Ex ∼ 6 MeV and spin ∼ 10. The experimental results have been compared with those from large basis shell model calculations that facilitated an understanding of the single particle configurations underlying the level structure of the nucleus.

We report measurement of the g-factor for the 11/2 − isomeric state at 535 keV in 133 La, employing the time differential perturbed angular distribution technique (TDPAD). This isomer was populated in the reaction 126 Te( 11 B, 4n) 133 La at beam energy of 52 MeV. From the observed nuclear spin precession, analysed through combined, magnetic dipole and electric quadrupole hyperfine interactions, we obtain the g-factor for the 11/2 − state as g = 1.16 ± 0.07. In addition, this analysis provides the spectroscopic quadrupole moment |Q| = 1.71 ± 0.34 b, yielding the deformation parameter β = 0.28 ± 0.10. Further, we have performed theoretical calculations using the large-scale shell model and the Monte Carlo shell model. The results successfully describe the low-lying levels and the band structures of 133 La, and the calculated g-factor compares well with the values obtained from our experiment. The dominant configuration of 11/2 − isomeric state in 133 La is inferred to be π(h 11/2 ) ⊗ 132 Ba(0 + ).

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